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    Thread: Boosts then no boost then boost AHHHHHHH

    1. Semi-n00b
      Join Date
      May 29th, 2011
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      Epsom New Hampshire
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      02 Audi A4
      07-10-2012 09:21 AM #1
      Okay so ive done as much research as i can talked to 20 people had my car looked at by 4 different shops noone can figure it out. I have a 02 a4 5 speed 1.8T. Mods are Samco DV, test pipe, samco TIP, APR stage 1+ upgrade which includes injectors and software with cat delete program. I also have a Carbonio intake. When I had just stage 1 with the intake, DV and TIP the car ran fine. Since I have done the Stage 1+ and the test pipe it feels like the boost shuts off randomly. Meaning I can be driving down the road and get full boost, come to a stop light and go to take off and it is like it got put back into stock mode. It is litterally that random. I have tried changing the DV spring for a stronger one still does the same thing. Plugs and coils changed, leak test done still does the same s**t. I have no clue anymore. Any help is appreciated.

    2. Semi-n00b
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      May 29th, 2011
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      Epsom New Hampshire
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      02 Audi A4
      07-10-2012 10:52 AM #2
      Also changed the K valve by the way.

    3. Member Roadie996's Avatar
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      Jun 25th, 2008
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      266
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      '04 a4 1.8t
      07-11-2012 10:27 AM #3
      I had this problem and it was because my PCV system was cracked in 3 different spots. Once I got that fixed, everything was perfect

    4. Semi-n00b
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      May 29th, 2011
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      02 Audi A4
      07-11-2012 02:34 PM #4
      okay thanks for the response ill check it out tonight

    5. 07-30-2012 06:26 AM #5
      Check the piping and valves first. I had a very similar problem. But unfortunately it was my ko3 dying.

    6. Semi-n00b
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      May 29th, 2011
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      Epsom New Hampshire
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      02 Audi A4
      09-27-2012 01:12 PM #6
      Well i hadn't been posting because one day it just boosted and day after day did fine now it goes in and out again. I just don't get it.

    7. Member gregg3gs's Avatar
      Join Date
      May 15th, 2004
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      Atlanta, GA (decatur)
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      04_A4_1.8TQ_SMS_K04+, 08_X5_4.8i; Previous: 01_A4_1.8_TQ, 01_Golf, 01_Jetta, 93_Passat_VR6_+_Garrett
      09-27-2012 11:17 PM #7
      Does it boost fine then stops, and boost is back on after you restart the car?

    8. Semi-n00b
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      May 29th, 2011
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      Epsom New Hampshire
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      02 Audi A4
      10-04-2012 08:37 AM #8
      Quote Originally Posted by gregg3gs View Post
      Does it boost fine then stops, and boost is back on after you restart the car?
      I haven't seen that it is effected by turning the car on and off its more of a random working then not i could be on a hour drive and one minute i try to pass a car and it pulls like crazy then i pull into my lane drive 10 miles and go to pass again and its like its stock again. My mechanic is an Audi VW tech and has built alot of cars and he is stumped which doesn't happen. IDK what it could be

    9. 10-10-2012 04:15 PM #9
      Did you find out the problem, cause I have the same exact issue.

    10. 10-12-2012 01:21 AM #10
      Quick update i fixed my random boost issue, it was a n75 valve. Didnt even have to change it, inside the n75 there was some kind of black material that came out easly. Put back the n75 and there was my boost.

    11. Semi-n00b
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      May 29th, 2011
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      Epsom New Hampshire
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      02 Audi A4
      11-27-2012 10:42 AM #11
      still havent fixed it im gonna check that though and see where it puts me

      I have a coolant leak now and no heat which suck balls in 20 degree weather so thats my first priority.

    12. Semi-n00b
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      May 29th, 2011
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      Epsom New Hampshire
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      02 Audi A4
      11-27-2012 10:44 AM #12
      is the N75 the same as the K valve?

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